Self-assembled monolayers of l-cysteine on palladium electrodes

Feliciano-Ramos, Ileana; Cabán-Acevedo, Miguel; Scibioh, M. Aulice; Cabrera, Carlos R.

doi:10.1016/j.jelechem.2010.09.001

Cited by 55 publications

(30 citation statements)

References 25 publications

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“…39 when using a SAM of L-cysteine at Au and I. Feliciano-Ramos et al . 40 when having a SAM of L-cysteine at Pd electrodes. Both groups worked at pH 7.0 and, although the carboxyl group has a negative charge, they attribute the enhanced reversibility to the local positive charge density of the amine.…”

Section: Resultsmentioning

confidence: 99%

Real-time detection of telomerase activity in cancer cells using a label-free electrochemical impedimetric biosensing microchip

et al. 2014

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The enzyme telomerase is present in about 85% of human cancers which makes it not only a good target for cancer treatment but also an excellent marker for cancer detection. Using a single stranded DNA probe specific for telomerase binding and reverse transcription tethered to an interdigital gold electrode array surface, the chromosome protection provided by the telomerase was replicated and followed by Electrochemical Impedance Spectroscopy as an unlabeled biosensor. Using this system designed in-house, easy and affordable, impedance measurements were taken while incubating at 37 °C and promoting the probe elongation. This resulted in up to 14-fold increase in the charge transfer resistance when testing a telomerase-positive nuclear extract from Jurkat cells compared to the heat-inactivated telomerase-negative nuclear extract. The electron transfer process at the Au electrodes was studied before the elongation, at different times after the elongation, and after desorption of non-specific binding.

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Section: Resultsmentioning

confidence: 99%

Real-time detection of telomerase activity in cancer cells using a label-free electrochemical impedimetric biosensing microchip

et al. 2014

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“…The two distinct species found in the N-1s spectral region ( Fig. 3b) with binding energies typical for amino (BE = 399.2 AE 0.2 eV) and protonated amino (BE = 400.7 AE 0.2 eV) groups [18,27] point to the coexistence of the neutral and zwitterion species in the cysteine-thiolate overlayer. The shift to higher values of the binding energies of the N-1s species observed at the n-doped GaAs indicates, however, different conformations/configurations of the cysteine-thiolate species formed at p-and n-doped GaAs substrates, in good agreement with the results of the fractal analysis discussed above.…”

Section: Xps Investigations On L-cysteine / Gaas(100) In Airmentioning

confidence: 93%

Field - dipole interactions in L-cysteine-thiolate self assembled at p- and n-GaAs(100) electrodes

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et al. 2015

Electrochimica Acta

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“…It could be concluded that using RTIL as grafting media allowed modulating the quantity of the attached layer and making a thinner and/or less dense layer in comparison with classical solvents. Cabrera et al described the modification of a palladium electrode by a self-assembled monolayer of L-cysteine [80]. The CME was characterized by CV, EIS, FTIR and XPS.…”

Section: Botelho Do Rego Et Al Performed a Cv/xps Investigation Of Tmentioning

confidence: 99%

X-Ray Photoelectron Spectroscopic Characterization of Chemically Modified Electrodes Used as Chemical Sensors and Biosensors: A Review

2015

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Abstract:The characterization of chemically modified sensors and biosensors is commonly performed by cyclic voltammetry and electron microscopies, which allow verifying electrode mechanisms and surface morphologies. Among other techniques, X-ray photoelectron spectroscopy (XPS) plays a unique role in giving access to qualitative, quantitative/semi-quantitative and speciation information concerning the sensor surface. Nevertheless, XPS remains rather underused in this field. The aim of this paper is to review selected articles which evidence the useful performances of XPS in characterizing the top surface layers of chemically modified sensors and biosensors. A concise introduction to X-ray Photoelectron Spectroscopy gives to the reader the essential background. The application of XPS for characterizing sensors suitable for food and environmental analysis is highlighted.

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Self-assembled monolayers of l-cysteine on palladium electrodes

Cited by 55 publications

References 25 publications

Real-time detection of telomerase activity in cancer cells using a label-free electrochemical impedimetric biosensing microchip

Real-time detection of telomerase activity in cancer cells using a label-free electrochemical impedimetric biosensing microchip

Field - dipole interactions in L-cysteine-thiolate self assembled at p- and n-GaAs(100) electrodes

X-Ray Photoelectron Spectroscopic Characterization of Chemically Modified Electrodes Used as Chemical Sensors and Biosensors: A Review

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